Auto jack



Jan. 22 1924.

D. F. BISHOP AUTO JACK Filed April 30, 1923 2 Sheets-Sheet 1 Jan. 22,1924. 1,481,676

D. F. BISHOP AUTO JACK Filed April 30, 1923 2 Sheets-Sheet 2 a base-1and provided at diametrically oppo- Patented Jan, 22, 1924.

entree STATES DEALEY IE. BISHOP, OF GREENVILLE, TEXAS.

AUTO JACK;

Application filed April 30, 1923. Serial No. 635,652.

,To all w 710m it may concern be quickly lowered without a sudden dropby the use of a single handle only.

Another object is to provide a tool of this character which is simple,small and light, having a removable handle to enable it to be packed ina small tool box.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it, being understood that changes in the preciseembodiment of the invention herein disclosed may be made withoutdeparting from the spirit of the invention. J r

In the accompanying drawings Figure 1 represents a side elevation ofajack constructed in accordance with this invention with the parts in thepositionassumed for lifting a load, the handle being broken oil? forconvenience in illustration.

Fig. 2 is a longitudinal vertical section through the pedestal withthecoacting parts shown in side elevation and the parts in the positionassumed when lowering the jack. Fig. 8 is a transverse section takenon'the line 33 of Fig. 2. 1

Fig. 4 is a top plan view, and I Fig. 5 is "a section on the line 5- 5.of Fig. 2. I 1

In the embodiment illustrated, a hollow standard or pedestal 2 is shownrising from site sides with ratchet teeth 3 arranged to resistdownwardmovement of cooperating pawls or dogs 6 and 7. The teeth 3 onone sideare arranged in staggered relation to those on the opposed side. Thedogs are pivotally attached at their ends to an'operating lever 10 whichis fulcrumedat a lifting head 15 carried by-a lifting or guide rod 16mounted for vertical movement in'the pede estal 2. The upper end of thelifting head 15 is made concave and serrated as shown at 17 tofacilitate its engagement with a vehicle axle or other object to belifted.

The lever 10 is bifurcated at its fulcrum end and straddles the head 15,the dogs 6 and 7 being pivotally connected at their upperends betweenthe furcations.

The lever 10 has a reduced extension 11 at itsouter end whichtelescopically engages a removable handle 12. This handle 12 may be ofany suitable or desired lengthsuflicient to provide the necessaryleverage and is removable to. enable the jack to be stored in a smalltool box.

Keepers 13 extend longitudinally of the outer face of the furcations ofthe lever and raters: PATENT oFF ca.

are secured thereto by riveting or otherwise and form guides forauxiliary dogs 14 and 14*, one of which is pivoted at one end to one ofthe first mentioned dogs near its upper end, and the other to theopposed face to the other dog. These dogs 1a and 14 extend through thekeepers 13 and are pro vided near their free ends withteeth or shoulders18 and intermediate their'ends with notches 19, which latter notches arede signed to be engaged by crank arms 21 and 22 of a crankshaft 20extended transversely through the lower port-ion of the head 15 andwhich are designed to hold the dogs ltiand 14 with their shouldersdisengaged from the studs 23 projecting laterally from the lever nearopposite endsof the. V

keepers 13. I

Coiled springs 24 and 25 yieldably connect the inner ends of the dogs14: and 14 with the dogs 6 and 7 respectively, whereby when the crank 20is released from said dogs, they will be moved into engagement a withthe studs 23"and yield-ably held engaged therewith.

The dogs 6 and '7 are yieldably connecied by springs 26 and 27 which areexactly alike and are here shown V-shaped with coils 28 formed at theirapices) These springs tend.

to move the dogs 6 and 7 toward each other and to hold them inengagement with the racks formed on opposite sides of the pedestal.

-Finger' grips 29 in the form of buttons or knobs are secured to theouter faces of the dogs '6 and '7 in advance of the springs whichconnect them and are designed for releasing the dogsmanually.fromtheratchet.

teeth on the pedestal when desired.

The pedestal 2 is provided along opposite edges of the ratchet teeththereof with flanges-8 and 9which form guides for the free ends of thedogs 6 and 7 to prevent the dogs from slipping laterally off the ratchetwhen in operation.

In the use of thisjack, the parts beingin the position shown in Fig. 1,the raising and lowering of the lever 10 by means of the handle 12 willoperate to alternately engage the dogs 6 and 7 with the ratchet teeth 3,thereby quickly lifting the head 15 and when engaged with the load,operates to hit the load to the desired extent.

When it is desired to let down or lift the head 15 and the load carriedthereby, the upper or auxiliary dogs let and 14 are tripped to disengagethem from the cra 'n; arms of the crank shaft 20 and theh'andle 12 israised until the first upper dog into place and the dogs 6 and 7 may!"l:u be moved downward stepby step to the load. When it is desired tolower the jack, a few inches only, the upper toga are not dropped, butthe weight is n't'ted from one of the lower dogs and the highest lowerdog is moved manually outwarc. by grasp ing the knob 29 carried thereby.

It is of course understood that the of this jack may he made of anysuitable strong material, the pedestal and base bei preferably of iron,but the dogs should be at good cast-steel.

From the above description it will be. ohvious that this jack may bequickly applied and removed and owing tothe double stroke thereof, willlift the load in a rapid manner and thatsaid load may be lowered quicklyin the manner above set forth.

When the ack is not in use, the handle 12 isremoved fromits engagementwith lever 10 and it may be stored in a comparatively small space.

Various changes in the form, shape, proportion and other minor detailsof construction may be made without departing from the principle orsacrificingany of the advantages of the claimed invention.

1. In a lifting jack, a fixed member, a. member movable vertically in-said fixed member, and provided with a head atits upper end, anoperating lever fulcrumed intermediate its ends on said head, racktcethcarried by said fixed member, a pair of pawls pivoted. to said lever onopposite sides of the fulcrum and depending therefrom, a springconnecting said pawls to hold their free ends normally in contact withsaid teeth, means whereby said pawls will alternately engage said teethto cause the movable member to ride upwardly, and means to permitlowering of the pawls by skipping a plurality ofteeth on each stroke.

2. In a lifting jack :1- stationar upright column with rack teeth on itsopposed faces those of one rack alternating with those of the other, amovable column mounted on said stationary column, an open leverfulorumed on said movable column, a pair of pawls depending from saidlever on opposite sides of its fulcrum and adapted to en gage said rack,yielding means tending to forcesaid pawls into engagement with saidracks to provide for the upward movement of the pawls and the movablecolumn on the rocking of the lever, and reversing means carried by saidpawls and cooperating with-saidlever to alternately disengage said pawlsfrom the racks.

3. In a lifting jack a hollow stationarv upright column provided with apair of v racks having outwardly facing teeth on its opoosite side, theteeth of one rack being arranged in staggered relation with those of theother rack, a vertically movable column mounted in said stationarycolumn and having an article engaging head. an operating leverstraddling and fulcrumed t9 said head, a pair or" main pawls pivoted toand depending from said lever on opposite sides of the column, andadapted to engage said rack. yielding means to force said pawls intoengageinent with said racxs and providing for the upward movement ofsaid pawls and the movable column in respoi'lse if) movements of saidoperating lever, auxiliary pawls caried by each of said main pawls. pinson said lever for engagment by said aaxilia v pawls, and a crank shaftcarried by said head to engage said auxiliar Y pawls and hold them outof engagement with said pins during the upward movement of the movablecolumn.

eL'In alifting jack a hollow stationary upright column providedwithapa'ir of racks having outwardly facing teeth'on its opposite side,the teeth of one rack being arranged in staggered relation with those ofthe other rack, a vertically movable column mounted in said stationarycolumn and having an article engaging head, an operating leverstraddling and fulcrumed to said head. a pair of main pawls pivoted toand depending from said lever on opposite sides of the Column,andadapted to engage said rack, yielding means to force said pawls intoengagement with said racks and providing for the upward movement of saidpawls and the movable column in response tomovement of said operatinglever, auxiliary pawls carried by each of said main pawls, pins on saidlever for engagement by said auxiliary pawls, and a crank shaft carriedby said head to engage said auxiliary pawls and hold them out ofengagen'ient with said pins during the upward movement of the movable'column, said pins operating as fulcrums for the main pawls duringthe lowering of the movable column.

5. Inalifting jack an upright stationary column provided on its opposedfaces with a pair of racks the teeth of one alternating with those ofthe other, a column movable vertically relative to the stationary columnand supported thereby, a lever fulcrumed on said movable column, a pairof main pawls pivoted to and depending from said lever on opposite sidesof the columns, and adapted to engage said racks, yielding means toforce said pawls into engagement with said rack, auxiliary pawls pivotedat one end to said main pawls below the pivotal connection of the mainpawls with the lever, said auxiliary pawls facing in oppositedirections, said auxiliar pawls having notches in their free'ends, pinson said lever for engagement by the notched ends of said pawls when thevertical column is to be lowered, said auxil iary pawls having notchesin their lower edges intermediate their ends, and a crank shaft toengage said intermediate notches when the'movable column is to beraised, thereby disengaging the notches or" the said auxiliary pawlsfrom said pins.

6. In a lifting ask an upright stationary column provided on its opposedfaces with a pair of racks the teeth of one alternating with those ofthe other, a column movable vertically relative to the stationary columnand supported thereby, a lever fulcrumed 011 said movable column, a pairof main pawls pivoted to and depending from said lever on opposite sidesof the columns, and adapted to engage said racks, yielding means toforce said pawls into engagement with said rack, auxliary pawls pivotedat one-end to said main pawls below the pivotal connection of the mainpawls with the lever, said auxiliary pawls facing in oppositedirections, said auxiliary pawls having notches in their free ends, pinson said lever for engagement by the notched ends of said pawls when thevertical column is to be lowered, said auxiliary pawls having notches intheir lower edges intermediate their ends, and a crank shaft to engagesaid intermediate notches when the movable column is to be raised,thereby disengaging the notches of the said auxiliary pawls from saidpins, and coiled springs for connecting said auxiliary pawls with saidmain pawls.

7. In a lifting jack of the class described a stationary upright columnhaving racks on its opposed faces, a vertically movable col umn on saidstationary column and having a head at its upper end, a lever tulcrumedon said head, main pawls pivoted at one end to said lever on oppositesides of said head, yielding means to force said pawlsinto engagementwith said racks, auxiliary pawls pivoted at one end to said main pawlsbelow their pivotal connection with said lever, cooperating meanscarried by said auxiliary pawls and said lever and head respectivelywhereby the auxiliary pawls may be alternately actuated for raising andlowering the main pawls.

In testimony that I claim the foregoing as my own, I have hereto affixedmysignature in the presence of two witnesses.

DEALEY F. BISHUP. Witnesses J. H. (1001;, C. T. Coon.

